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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.myfaces.orchestra.viewController;
20  
21  import org.apache.myfaces.orchestra.frameworkAdapter.FrameworkAdapter;
22  
23  /**
24   * Provides facility to look up the ViewControllerManager instance that is used by
25   * Orchestra to invoke lifecycle methods on "controller beans" associated with the
26   * current view.
27   * 
28   * @since 1.3
29   */
30  public class ViewControllerManagerFactory
31  {
32      private final static ViewControllerManager DEFAULT_VCM = new DefaultViewControllerManager();
33  
34      /**
35       * Returns the singleton ViewControllerManager object.
36       * <p>
37       * If a bean with name "org.apache.myfaces.orchestra.viewController.ViewControllerManager" exists
38       * then this is returned. This bean is expected to be a singleton.
39       * <p>
40       * Otherwise a singleton instance of {@link DefaultViewControllerManager} will be returned.
41       */
42      public static ViewControllerManager getInstance()
43      {
44          ViewControllerManager manager = (ViewControllerManager)
45                  FrameworkAdapter.getCurrentInstance().getBean(ViewControllerManager.VIEW_CONTROLLER_MANAGER_NAME);
46          if (manager != null)
47          {
48              return manager;
49          }
50  
51          return DEFAULT_VCM;
52      }
53  }